Continental ice sheets advance like a bulldozer, pushing mounds of debris ahead of them, this debris that is known as a Moraine. When the progress of the ice sheet stops, this debris is left as a curving irregular ridge, which marks the outline of the furthest glacial ridge, this is known as a terminal moraine and marks the furthest distance reached by the glacier. A recessional moraine develops when an already receding glacier becomes temporarily stationary. Material that is still being carried by a mountain glacier is known as an active moraine because it is still in motion.
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